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Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
27 lines
1.1 KiB
LLVM
27 lines
1.1 KiB
LLVM
; RUN: llc -mtriple i686-pc-cygwin < %s -filetype=obj | llvm-dwarfdump - | FileCheck %s
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; RUN: llc -mtriple i686-pc-cygwin -split-dwarf=Enable < %s -filetype=obj | llvm-dwarfdump - | FileCheck --check-prefix=FISSION %s
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; Expect no line table entry since there are no functions and file references in this compile unit
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; CHECK: .debug_line contents:
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; CHECK: Line table prologue:
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; CHECK: total_length: 0x00000019
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; CHECK-NOT: file_names[
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; CHECK: .debug_pubnames contents:
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; CHECK-NOT: Offset
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; CHECK: .debug_pubtypes contents:
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; CHECK-NOT: Offset
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; Don't emit DW_AT_addr_base when there are no addresses.
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; FISSION-NOT: DW_AT_GNU_addr_base [DW_FORM_sec_offset]
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1 (trunk 143523)", isOptimized: true, emissionKind: FullDebug, file: !4, enums: !2, retainedTypes: !2, globals: !2)
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!2 = !{}
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!3 = !DIFile(filename: "empty.c", directory: "/home/nlewycky")
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!4 = !DIFile(filename: "empty.c", directory: "/home/nlewycky")
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!5 = !{i32 1, !"Debug Info Version", i32 3}
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